I don't know if PhotoClam are as expensive as Markings now, but I got one relatively cheaply from Taiwan before they were generally available in the US. Much easier to get the shot lined up without that annoying sagging as you are tightening it. For me also actually better than the Markins because the rotation portion can be tightened more than with the Markins, at least when I was looking.
I don't want to offend people personally because they like their Manfrotto gear, but honestly in MY opinion Manfrotto is junk for 'serious' use. Maybe good value for what it is, like say an EF-S 18-55, but limited. Once you move up, I would suggest getting something you are not going to have to replace, but it will cost you as much as a good lens - although in reflection it now seems quite reasonable to me.
You do want to make sure the ballhead you want is compatible with the clamp you want (and the tripod, although that is not usually a problem). One reason I didn't get the ArchaTech - I didn't care for the clamp and it won't fit a RRS lever clamp.
Buying a good tripod/head/clamp (after my first cheap one to get re-started) was the hardest buying decision of any camera gear for me.